Thanks. I'll try that.Local stores will have the K-2005 equivalent, but not the K-2006 which contains the FAS-DPD (powder & drops) part of the kit. We can't rely rely on a CYA test below 30, so if it's low you do want to increase it to 30 minimum. Maybe add about 20 ppm worth and re-test in a day or two. For the brown ring, you can "gently" try a Magic Eraser. Do a small test area first though to ensure you don't accidently rub-off the pattern.